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Speed Converter

Convert any speed unit to another with this free speed converter. It supports 6 units including meters per second, kilometers per hour, miles per hour, knots, feet per second, mach. Pick a conversion below for a dedicated calculator, formula, and reference table. For example, 1 m/s = 3.6 km/h.

All speed conversions

Meter per Second → Kilometer per HourMeter per Second → Mile per HourMeter per Second → KnotMeter per Second → Foot per SecondMeter per Second → MachKilometer per Hour → Meter per SecondKilometer per Hour → Mile per HourKilometer per Hour → KnotKilometer per Hour → Foot per SecondKilometer per Hour → MachMile per Hour → Meter per SecondMile per Hour → Kilometer per HourMile per Hour → KnotMile per Hour → Foot per SecondMile per Hour → MachKnot → Meter per SecondKnot → Kilometer per HourKnot → Mile per HourKnot → Foot per SecondKnot → MachFoot per Second → Meter per SecondFoot per Second → Kilometer per HourFoot per Second → Mile per HourFoot per Second → KnotFoot per Second → MachMach → Meter per SecondMach → Kilometer per HourMach → Mile per HourMach → KnotMach → Foot per Second

About these units

Meter per Second (m/s)

Definition
A meter per second (m/s) is the SI unit of speed, the distance in meters travelled each second.
History
It is the coherent SI speed unit derived from the meter and second.
Current use
Meters per second are used in physics, engineering, and wind-speed reporting.

Kilometer per Hour (km/h)

Definition
A kilometer per hour (km/h) expresses speed as the number of kilometers travelled in one hour.
History
It became common alongside metric road networks and the automobile.
Current use
Kilometers per hour are the standard speed unit on roads in most of the world.

Mile per Hour (mph)

Definition
A mile per hour (mph) expresses speed as the number of miles travelled in one hour.
History
It developed with road and rail travel in Britain and the United States.
Current use
Miles per hour are used for speed limits and vehicle speeds in the US and UK.

Knot (kn)

Definition
A knot (kn) is a speed of one nautical mile per hour, about 1.852 km/h.
History
The name comes from knotted ropes once used to measure a ship’s speed at sea.
Current use
Knots are used in marine and air navigation and in meteorology for wind speed.

Foot per Second (ft/s)

Definition
A foot per second (ft/s) expresses speed as the number of feet travelled each second.
History
It derives from the foot in imperial and US customary units.
Current use
Feet per second are used in ballistics, sports, and some US engineering.

Mach (Ma)

Definition
Mach is a ratio of an object’s speed to the local speed of sound, so Mach 1 is the speed of sound.
History
Named after physicist Ernst Mach, the number became important with high-speed flight.
Current use
Mach numbers describe the speed of aircraft and spacecraft in aerodynamics.

Frequently asked questions

What speed units can I convert?

This speed converter supports 6 units: meters per second, kilometers per hour, miles per hour, knots, feet per second, mach. Select any pair below to open a dedicated converter with a formula and conversion table.

How accurate is the speed converter?

Conversions use exact definitional factors, so results are accurate to the precision you need for science, engineering, and everyday use. Values are rounded only for display.

Is the speed converter free?

Yes. Every speed conversion is completely free, needs no sign-up, and runs entirely in your browser — your inputs never leave your device.

Free, private, and instant — every conversion runs in your browser.

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